I have a chance to get 2 sets of the AT M2 at a pretty good price...used. Or I can buy the Carvin EM900 new. This will be used for 2 things....IEM at my house to practice and to send a signal to my powered speakers when I have an event. So with the AT I would be getting 2 full setups (2 transmitters, 2 receivers, etc), with the Carvin I would be getting 1 transmitter and 2 receivers. Anyone used both?